Revert "printf(1): don't use getopt"
This reverts commit 8a65ba3d8f8a805773a99458f6f18f034ad84d57.
printf.c is included by /bin/sh, and the internalized version is
used by apropos which passes it '-- fmt ...'. FreeBSD and NetBSD
and probably others use getopt(). We have to too or we break --
use.

This is simply wrong. If you don't want to print --, don't pass it. This is a clear violation of the standard. If NetBSD and FreeBSD feel like doing this, fine, but we should not.